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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0969cdae5c6568a25b085ffac8d60e19357feecb008e2e3804b12aaf654be423' 
  AND token = '6MYq254NtWIbpRFsDvIxr7sgboFIAWo0xqsyMiLbzdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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