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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e135eb55c3d13b199934e7855c65d2cd7078406b97dcf77e70ea7454a00e9dc6' 
  AND token = 'wwC9Sp9K0L7qzUVBKxZ5+mBwu9ZF+GMMECqV2AaP24c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}