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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb193bd62c7e836528242885e1cc1efafd69f72a2d1c12de7ae30c42ea6a92a' 
  AND token = 'Ajd08LBtojhou3rE++KRp5Q+x/+Y+AbtC/Wy4FEv6wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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