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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7487720cb56088e2d8e65c37ec85e2eafeccab478dc45a63174666657c5005ca' 
  AND token = '/2Py6cfaIsMRiv3EGdO9oBL4/m9vvkb3DNqFThY3zuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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