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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8185422e7770eea75cc030731e1a6d1571fda0c3a2ce099388ed212e352437e3' 
  AND token = 'V9fMUfcjjJOb7He9kx9nys9L+bRU6HbyShCRT0rIv/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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