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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6bc2d21b0e076f4e4d86a3526270570db64e15ff3050930e4879d9eb247ec2' 
  AND token = '0itaJHONSi5aWdEuunEpVSndKXevCT0gtOszL2N7Y8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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