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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b533d5db2ca5e65dc8c7f0341eb51f006863157548e7ea3127f899efc00d3e0' 
  AND token = 'BveGRrw7bgScqxMVZZtAvIhAWMWbl3ERPCfY58fD6cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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