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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7ac65fc881ec83a39d9926f20092f3b120c2b26b0440b1bb56eb0e1db9c338' 
  AND token = 'U130/r9s3WHTI5mytz28KVjcMujmlcC3JL9KmDXYArI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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