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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56bd4a93150f6f9b7d7008baf316e169ab278e8e7249e629203ca0198a0344d' 
  AND token = '5dlpj2HCuEINZ6p17w00oHdtVv/1vBgK9Er8g/tui/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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