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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95828e8608a79ebe467a403cb343ed4a319f76cc57beec2857b270135cdc08b7' 
  AND token = 'EvuNsBsei7/GBjU2/WC/6C8/JEEH3Lgg9IEiH7h1yFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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