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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4692dbce01f9e9a03354e34acea91b9d1edf84b1af46e6269fafb201f2a873a' 
  AND token = 'NpccxSKcV31TlHdkYBpCCDMgk9tptCysgjKwfUe4pNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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