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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fae20693b4612eb9b322320e64e1aa07bd3797ce931e67fb7434d05305f312a' 
  AND token = 'DH23wZcw3pmCV1UXyeKy6Rp9X6f/ZrJSJ5lAHXyG3Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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