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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d602f294ae1a7a8c094be5654f1a6a6a170d272cf70e04d0fd1a97bb244472c' 
  AND token = 'qNi6fRuvTzTV+v3iIwrpAKtk7OxmXrCGCFCEOJOVb9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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