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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7dd8d96442af93680d818e2edc78f9d21dac9cfa51c991a7bfa1622c661e9b' 
  AND token = 'oGmVc1RLjhFjY+nRMhMDvEdstUOO/baPSy6qUvGitss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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