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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1268a5c828f3992f73e3302340c18c0b44e0f09c86a8280d110d17bc8f82f5b7' 
  AND token = 'rFl0AcYAiVYxqXdzYi9xeYnHE0wIecqu2YZHzWu/SMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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