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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d6c919b48c45f60707657b81daf37cfa9148792c62975a629ab49108450076' 
  AND token = '0woya/b1QtHHOaLTbeyNabuTg4DAlRj+BQ8spzm0+GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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