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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128c644e3265f3b0421298d424c315827c639d56f850ab14e7815322729e1aab' 
  AND token = 'DhxF0hvP9kpURHE7cZQ3Kv4Fax3tBta4k4yRo0L/I1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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