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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fbfe7e1e24e933cc7a6a9dbd92c7393bb229f6f5f7de3492b54101218087288' 
  AND token = 'DcMf+kTVrdX15bHKwogSxk6NRtALR2J9lwdsL96Q/ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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