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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea3e04af77f62296ada7929b3b77d629c37633cd5e1cf4267445f48bce40bdc' 
  AND token = 'BRaWa0QR8ANLGoXOWC0zonHnD0q+qarxu8cZ5lhS8lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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