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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4c9668bd4411975b74d12f76b7d4096c97b912cfe8cbda87c8b838ff2e0ed2' 
  AND token = 'yLWB0uVkmFcWOmDgeBcWGRMlzfq48Nm7jQTA4BRcI9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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