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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14fe3db6a4295e57cc242e06ced9d819ef10e6ba8772a009612e59ab7add5f6' 
  AND token = '/iBWXMN9ElU0iQQbNP98yzFY663k3el/isT7Mn6Rahg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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