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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0a8fed70ea03a701eab124c38cc389bef8fbac05a48210dc0c09d9be7517d1' 
  AND token = '+bUrF/sCgYjbb1WMCzI5IsdyFxb0H0Ub5ITxkEaNKMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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