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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f134abf7d35319ae7120a75550cfa33a81b1c5ddf74e18f412ae0b48f39f25fc' 
  AND token = 'LKoChZ7yozBEansEaFH0cXxPzTgXxCRhFzmPhqdIG1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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