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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263a86b4d0defba1aa070bb6466d01e962d47b64d23aa5a1a99a11e82f40a640' 
  AND token = 'xTKBOnbebdfFWIysBW74VD51GYkX+9TTuG4RAnBXZ5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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