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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3845b21263993a258d2568999036c39774b3cd789d24cf3d402beb8c7dd9f91' 
  AND token = 'hk94doB/EzgNb9bxygqIg5SJ1ryJ8P7a2RJtM0OO/2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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