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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb15b567fd170971c7271875399bf3b1fc6a02ae7600f11a79fdb7c8d3707cf' 
  AND token = 'NjXMmCTvX9d7ebg9GQhE9wctlJNkK/xPm6s+OFp3UGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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