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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa804a4624b8524a3b2c55e74fb9222211f45ebd0fed262f8f7100bcd7b93fb4' 
  AND token = '6XGlbU+WP4DmOGoeaEd7OhZUxteLxcL54QGX81IoS7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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