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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c5f74d8e1b98cb72fe46063072722646e54ee4127c95ff6a7ce3b37f8ba3a2' 
  AND token = '0BxTKddJbpXN0Z82LtLBsnvPjI8I+umIhb1MpuBakaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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