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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a8ada58a6b6aadfcc54b791b88ac7ab831f42d40bca1a9ab9a0550d179f0bd' 
  AND token = '2e1rckvzqV/y8wBLKFJOzYSpeSvkf3p0x7m9w+jAp4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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