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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027902ad763610d1f1ac1e1167a6a41a42173a34981a497ce767a8b6825a722d' 
  AND token = '6NEzD83LtU3xfzfcFl/Lbgt2I6HFdW6I/LHkE7r/xhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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