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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ddbd1e53b9d25ed80965a5090fffdf3b5f8df43038b010ae313e51d7046d75' 
  AND token = '/0mrvQDwcGPKj3ho5Vr57/39y1hqcZD5fIXVDWiDqnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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