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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '443755569123adb1568ba130cd9b740d7413d354cecd3849940b906bb820d0a9' 
  AND token = 'vbul1xjNBrRpRu/AZMvYdyHZq3w9sr298LN1Hi1tP/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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