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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74af374816880fdf100bcb1cefece81bf6f6a83f841b759b79fc0cc23cfa2277' 
  AND token = 'mDYgUp/p02i2rIhh9nX0HWiWQiIHaaQTlsJe9j8+BqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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