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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0871aca50c920055c2c94a3555910681b497af986b4b5c440cec93f6e4d2035d' 
  AND token = '2tdu/y21mQ8QLFR+i/eP+HNH2AMrsOZ25GyoX+/QpcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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