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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa5ab37444f90c18a4f86f3e49ccb9414c77f3d42cbf7ebfe43bb825ec67fe0' 
  AND token = 'luT4GlHod3YQt0TciDXWEMXY5BVm5OGO0gghtPVz5EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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