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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd092f57cd1c867f5a4f539254ba617b3909a46531382ae1f6ebe48af0ea9d4e1' 
  AND token = 'vTBTzX/+IDzpE7mE1QOvdRG4z7NP2mGOuB6AtYWy9Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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