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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2bd3d8254bf71e8e422dead6a69d6df05ea214ba6678fb55d353c560dda1bc' 
  AND token = 'yOxYgeL79KQEKdcd7eBg/ReXZg4GYGyYyFYJTMkJ7vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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