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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc65207eebe523bda8f7d3af09cd0c964a59b53d052df3c7405e9cfeeeabbbc3' 
  AND token = 'qsRe1Sw6e8pVkEtGTc13piZ5JXA+3X+KTKhN/TlAP84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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