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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '173eaf77ef5ee7cc9b75d263a8973b8720f2ee3074996b88ba388a75e27797d9' 
  AND token = 'AyLWH1tx2IoI0eNeATQ8jA7ZNV9dbS3JTDTmPtRgZuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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