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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7916228bb155fd7ad6e32c32150006567520a2d425fae9c62351e68a65803a2a' 
  AND token = 'O/B1PXSGh4H9GWZoRWTLzIEWtOnynvXJgrVV2rm4l/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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