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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2a162c976270f17a40fae4cfe18a1365f70c0041c029475ad6e69c929f2a9d' 
  AND token = 'NAveC+ZC0hf96hM0wJ2x9/bqu50JbCGODcBg+Yyn088=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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