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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c484639dca6fad5ea26b690b9e8414c4de7f7538d8c49ae101079fbd73a27e9' 
  AND token = 'cpdzO5kk/XTgmE99oCi9WJ79YY+FGXzO0+s8iTJTsDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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