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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4b5ed67e2dadd2510493ca4ff76243df74a415fb77d0a30c17649efc9847ae' 
  AND token = '78a1Gac3IsktF7K01Qkc8kt/0E0/3yDfPpJbV2m+HT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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