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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c2023eff5f54f6a03eacccfc22aa28ef56b62829f7890291b0bc0cf1e8c0ff' 
  AND token = 'Xw6/sFCzWIKQVMmYdwuizEJuQMyUqc6ZT8O74Oe0LE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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