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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31ea4cd1c4f215fb7bc63f6f242456ffaac8ff2bba981ce013866b4255a4a6c' 
  AND token = 'fsZbi4uMGIIOHhSLxLphX1lZJJB1Q6ueSU6cU7whE6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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