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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c068dec36f81c91cc5e3e38aad3e0775907a57697b150fa27f9b2fcf84f79961' 
  AND token = 'OlT+CBlRHp84tzl6sp1+o4k+1X1DxHlA0oM9vX3ETs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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