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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14fed4b8667b7312828c6470b1c456604bfa4f1334f963262ae6faefe7a8e51c' 
  AND token = 'huCNjm1us45tPW7g4OF8eO9BnDPKoW0ePlh0LPLByX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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