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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7cecaf5cfce786347ce7da1423d40a9059223dba2e447ffd171d932907cb45' 
  AND token = 'jydsDWhwv6GpFYOM5cn5k4g4FJr+u6nJ2ZRls43Pg3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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