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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629da852ed5da7e1c3d46f2040e6063d581d577bc4665b63e7982370bd18d583' 
  AND token = '5L3y4cq7R4uQbz56tQKfNPoaKpuNUs6aY9SkbidaZnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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