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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085a8f73a4de1065011db49f9ae2b11003daaa0bea3ce9d78ddd9fca700e15a7' 
  AND token = 'bhImwCDClYBmu6CxkO6DVN77ElJ7un1J22bSp/Oorsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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