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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095b114179822fe1c402aed3253e246d39a31537433a1b2ea4c909c92409feb7' 
  AND token = '9nN2lmyQWTyEYcUDdDUnGlu53pXXnR4RaefFGpvZ258=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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