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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68221fbe40d607b1cdbe8b84378cfa75ae950c63bcdd7b4989750c11997b20d0' 
  AND token = 'ML8OHphmHivF9YXdaEu4bta7Uq++isad8CjXBy5ZwKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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