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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd084fb60e5a2b23f678a034d55b0c93c8c2b765a331fb1cb3349e05da53f1af0' 
  AND token = 'FTfWwChGUW381dPFTbPnUCnwLE3WROutT6CsWXGep4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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