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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af41167edc542b0d64cfedf016063b3696d33048fb40e12b46189520379a49b' 
  AND token = '2WaU2+jyHgPYKDls/7Wpg+H7/3ZRywgRm2Se1+XdbgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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