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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8bb2c845e29b5b22db0a36d3f40f0ddc941cdb5f999fe7e2c0fe7c26125ecad' 
  AND token = 'ye4KeA6ZQgn927sPaNTnwizP8q7fbVDUaZKTHgLMjxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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