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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a699fa76d73f51fd0aec7bff139f37b0340af60d2b0acee534cd504f8a82b3' 
  AND token = 'DsQuSc54KuTh0oixFJLU40RIMXpbPRqXlFtfcI1M9/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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