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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df0d6bf614b2a84eb30fc408ad8f33e689279cdba9729e1a8c3e649504f6b94' 
  AND token = 'XhmnPAW9ytE1oKtom1FkZFLGBqCtEpvLiCN0rwgW77Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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