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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0afdfa6fa6710d6d150e2f6dec517b71e43086224b78daab66cd0abb0c94ee' 
  AND token = '2nxf5s+iEIAWkx6s04uX0uQ8iSsK6DYeXF1diKzJ/TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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