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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6295d3bf98d679838ff3e540d78e06104bc375d171d19d7d8e387ec0b3bedb7d' 
  AND token = 'Q0oTlJUS6GW2R9MYRBlLAhmzAOR9mWBcc7HYMHkYvVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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