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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faaec53491029e1a2e8e201e8edcf30e61abf7d389327b8f347394a1b86ca513' 
  AND token = '3hOeAHyDrB5RBMec53Tf0gG57CQVbVTuCXZnR10+aSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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