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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b9939245bb062baffefda406ba81760642d5e18d4f4bb59e21a1f3b2b15cb3' 
  AND token = 'C627lJS/5WAYl0sCVVCecSN3P4QGkkQUksp0nxQJQ7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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