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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0bf33de1841e3a47f669b5d00bb8fd090194f6f75413fa8a7d4752922e381b' 
  AND token = 'nxkR+cQ8rHFJbCZQCaFOmVJhCfGkxxOuoFvSi5/b5ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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