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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f2edcf797c8822e4345162ceab02c9d25d760161e76681e1fb3abfa135f8dc' 
  AND token = '0CAFdTrv6x4DgSso25aIklsYmYb11KWly2Vzvnmh9is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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