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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2118a4112d1c735d0a47fdd1d5c1689af59857492582b208896efb87805b802e' 
  AND token = 'WG3JQH5jpVehr9wjgR2ieCGWoLn0t6rmSA8APJ7kHvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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