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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3abc9cb800fb6ce80017c19df129cfac92a1f5d50f8cea8966c190bce49cb1' 
  AND token = '4c/LjpdDzgIJuXw1GjOmUrpmuSeH7NVqGXgOgcEYd4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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