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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bb9116092f1ffb8ed01e459a8747dd05a8906c1fb2518cd10c435ac29876a7' 
  AND token = 'tqa19I9GlJZo2RSxC4f6LOKczvQ+O/l9IEqh9iqjNU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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