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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3e02abebe0e389e2a09797767164d69a4348153d1fd6b1826d51808048a68d' 
  AND token = 'CQ/lB/7XQRtwwkm4tcYvJ9zTi9CnS6lg7Ab5LZ6ouUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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